题目

The first thing ______ we should do is to tell him the mews.             A. who       B. which      C. that          D. whom 答案：C（2012•上饶一模）下面四个图象中，有一个是函数f(x)=13x3+ax2+(a2-1)x+13(a∈R，a≠0)的导函数y=f′（x）的图象，则f（-1）等于（　　）A．-1B．-13C．1D．-13或53